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| TM EV2305DS-00A 4.75V to 23V IN, 2A OUT Synchronous Buck Converter EVALUATION BOARD The Future of Analog IC Technology TM DESCRIPTION The EV2305DS-00A is the evaluation board of MPS' MP2305 synchronous buck converter. It has a wide supply range from 4.75V to 23V and a continuous output current up to 2A. It features synchronous rectification for high efficiency with integrated high-side and low-side power MOSFETs. The output voltage is preset to 3.3V, but can be easily adjusted to other levels from 0.923V. Current mode control and integrated power MOSFETs minimize component counts, board area, and solution cost. Fault condition protections include cycle-by-cycle current limiting, thermal shutdown and under-voltage lockout. Programmable soft-start reduces turn-on stress. Small SO-8 package minimizes board area. FEATURES * * * * * * * * * * * * Up to 2A Output Current Wide 4.75V to 23V Operating Input Range Monolithic Synchronous Buck with 130m High-Side and Low-Side FETs Fixed 340KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under Voltage Lockout Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 to 23 3.3 0 to 2 Units V V A "MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc. EV2305DS-00A EVALUATION BOARD Efficiency vs Load Current 100 95 90 VOUT = 3.3V VOUT = 2.5V EFFICIENCY (%) 85 80 75 70 65 60 55 50 (L x W x H) 2.0" x 1.5" x 0.5" (5.0cm x 3.8cm x 1.2cm) Board Number EV2305DS-00A EV2305DS-00A Rev. 1.5f 9/14/2005 0 0.5 1.0 1.5 2.0 LOAD CURRENT (A) 2.5 MP2305-EC01 MPS IC Number MP2305DS www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 1 TM EV2305DS-00A - 4.75V TO 23V IN, 2A OUT SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC SS EN 1 BS SS 8 C1 10nF VIN 4.75V to 23V 2 IN EN 7 C7 OPEN R5 OPEN C8 OPEN MP2305 3 SW COMP 6 C3 3.3nF 4 GND FB 5 C4 OPEN U1 SW D1 OPEN C5 OPEN VOUT 3.3V/2A EV2305_S01 EV2305DS-00A BILL OF MATERIALS Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Qty 1 1 1 4 1 1 1 1 1 1 1 1 1 1 Ref C1 C2 C3 C4, C5 C7, C8 C6 C9 D1 L1 R1 R2 R3 R4 R5 U1 10H 26.1k 5.6k 10k 100k OPEN Value 10nF 10F 3.3nF OPEN 0.1F 22F Description Ceramic Cap, 50V, X7R Ceramic Cap, 25V, X5R Ceramic Cap, 50V, X7R Not Stuffed Ceramic Cap, 50V, X7R Ceramic Cap, 16V, X5R Do Not Stuff Inductor, 2.5A Resistor, 1% Resistor, 5% Resistor, 1% Resistor, 5% Not Stuffed DC-DC Converter SMD SM0805 SM0805 SM0805 SM0805 SM0805 SO8 MPS MP2305DS Sumida Panasonic Panasonic Panasonic Panasonic CDRH8D28 ERJ-6ENF2612V ERJ-6GEYJ562V ERJ-6ENF1002V ERJ-6GEYJ104V SM0805 SM1210 AVX AVX 08055C104KAT2A 1210YD226KAT2A Package Manufacturer Part Number SM0805 SM1210 SM0805 AVX AVX AVX 08055C103KAT2A 12103D106KAT2A 08055C332KAT2A EV2305DS-00A Rev. 1.5f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 2 TM EV2305DS-00A - 4.75V TO 23V IN, 2A OUT SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1--Top Silk Layer Figure 2--Top Layer Figure 3--Bottom Layer QUICK START GUIDE 1. Connect the positive terminals of the load to the VOUT pins and the negative terminals to the GND pins. 2. Preset the power supply output to 4.75V to 23V and turn it off. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal to the GND pin 4. Turn on the power supply; the MP2305 will automatically startup. 5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 2.5V to turn on the regulator or less than 0.7V to turn it off. 6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor divider (R4 and R5). The EN threshold is 1.3V, so VIN UVLO threshold is: 1 + R4 x 1 .3 V . R5 NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EV2305DS-00A Rev. 1.5f 9/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved. 3 |
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